/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.api.audit;

import org.apache.dolphinscheduler.api.configuration.AuditConfiguration;

import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;

import javax.annotation.PostConstruct;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class AuditPublishService {

  private BlockingQueue<AuditMessage> auditMessageQueue = new LinkedBlockingQueue<>();

  @Autowired
  private List<AuditSubscriber> subscribers;

  @Autowired
  private AuditConfiguration auditConfiguration;

  private static final Logger logger = LoggerFactory.getLogger(AuditPublishService.class);

  /**
   * create a daemon thread to process the message queue
   */
  @PostConstruct
  private void init() {
    if (auditConfiguration.getEnabled()) {
      Thread thread = new Thread(this::doPublish);
      thread.setDaemon(true);
      thread.setName("Audit-Log-Consume-Thread");
      thread.start();
    }
  }

  /**
   * publish a new audit message
   *
   * @param message audit message
   */
  public void publish(AuditMessage message) {
    if (auditConfiguration.getEnabled() && !auditMessageQueue.offer(message)) {
      logger.error("add audit message failed {}", message);
    }
  }

  /**
   * subscribers execute the message processor method
   */
  private void doPublish() {
    AuditMessage message = null;
    while (true) {
      try {
        message = auditMessageQueue.take();
        for (AuditSubscriber subscriber : subscribers) {
          try {
            subscriber.execute(message);
          } catch (Exception e) {
            logger.error("consume audit message {} failed, error detail {}", message, e);
          }
        }
      } catch (InterruptedException e) {
        logger.error("consume audit message failed {}.", message, e);
        Thread.currentThread().interrupt();
        break;
      }
    }
  }

}
